CNC machining center finishing common problems and solutions

In recent years, the numerical control technology has become more and more mature, and the machining precision of CNC machining centers as processing equipment is getting higher and higher, and the finishing ability of machining centers is getting stronger and stronger. Finished workpiece surfaces often have defects, so what should be done after problems occur on the surface of finely machined parts? After the workpiece is processed, ellipse and ridge are produced, which is commonly called workpiece deformation. The main reason for this kind of phenomenon is that the spindle bearing clearance is too large, the spindle bearing wears, or the spindle final gear accuracy is out of tolerance, the outer diameter of the spindle bearing sleeve is elliptical or the headstock shaft hole is elliptical, or the fit gap is too big. Solution: Adjust the clearance of the spindle bearing; if it is high-speed cutting, the adjusted clearance can be slightly larger. If it is often operated at low speed, the clearance is smaller. If the spindle clearance is adjusted at a low speed, the axle-holding phenomenon may occur during high-speed operation. The general clearance should be between 0.02 and 0.04 mm. Cylindrical workpiece that is prone to deformation In addition, the cutting speed is also the reason that affects the finishing of CNC machining centers. The machining center is a highly mechatronic product. The high-speed spindle ensures high-speed cutting, and there are many factors affecting the cutting speed. The following points should be noted when selecting the cutting speed: Tool material The maximum cutting speed allowed is different for different tool materials. High-speed steel cutting tools have a high-temperature cutting speed of less than 50m/min, tungsten carbide tools have a high-temperature cutting speed of over 100m/min, and ceramic tools have a high-temperature cutting speed of up to 1000/min. Workpiece material The hardness of the workpiece material will affect the cutting speed of the tool. The cutting speed of the same tool should be reduced when machining hard materials, and the cutting speed can be improved when processing soft materials. If the tool life requirements are long, a lower cutting rate should be used. Conversely, a higher cutting speed can be used. Cutting depth and feed rate The cutting depth and the feed amount are large, the cutting resistance is also large, the cutting heat is increased, and the cutting speed of the numerical control machine tool should be reduced. Tool shape The shape of the tool, the size of the angle, and the sharpness of the cutting edge all affect the selection of the cutting speed. In order to prevent the deformation of the workpiece and the cutting speed, the CNC machining center can perform fine machining better.